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Arada [10]
3 years ago
15

A male Flagus fly with the Barkus phenotype is crossed with a female who has the wild-type phenotype. A second cross is performe

d in which the female Flagus fly has the Barkus phenotype and the male has the wild-type phenotype. This second cross is known as a:
Biology
1 answer:
Salsk061 [2.6K]3 years ago
4 0

Answer:

Reciprocal cross

Explanation:

a reciprocal cross is a breeding experiment designed to test the role of parental sex on a given inheritance pattern. In this type of test cross, male of one genotype and female of different genotype are  crossed and the opposite is true as well. ( i.e the female of one genotype and male of different genotype are crossed.)

As we can see in the male Flagus fly with the Barkus phenotype is  being crossed with a female with the wild-type phenotype.

In the second test, we can see that the opposite is true of our first statement where the female Flagus fly has the Barkus phenotype and the male has the wild-type phenotype after being crossed again thereby reversing the genotype.

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A small branch of the optic nerve, known as the ____ path extends directly from the retina to the scn.
svetoff [14.1K]

Answer;

Retinohypothalamic path


A small branch of the optic nerve, known as the retinohypothalamic path extends directly from the retina to the SCN.


Explanation;

The SCN is an abbreviations for suprachiasmatic nucleus or nuclei; which is a region in the hypothalamus. that is responsible for controlling circadian rhythms.

Retinohypothalamic path is a neural input pathway that extends directly from the retina to the SCN.


7 0
2 years ago
Describe the Watson and Crick model of DNA structure. How did it fit the data provided by Chargaff and the X-ray diffraction pat
icang [17]

DNA model given by Watson and Creek in the year of 1953 gave a very detailed study regarding the structure of B DNA which is valid till date and is essentially corroborating with Chargaff's data and Xray diffraction pattern.

<h3><u>Explanation:</u></h3>

The DNA is the most common nucleic acid found in the living organisms as a genetic material. As stated by Watson and Creek, this DNA contains a double helical structure with two sugar phosphate backbones and the nitrogen bases getting projected from it inwards. The backbones are formed of ribose sugar and phosphate and joined together with a phosphodiester bond. The ribose sugar is attached to phosphates at its 3' and 5' Carbon atoms. The nitrogen bases found in DNA are Adenine, Guanine, Thymine and Cytosine. The Adenine has two hydrogen bonds with thymine and guanine has 3 hydrogen bonds with cytosine.

Each full turn of a helix is 34A and each base pair is 3.4A apart. The distance between two strands of DNA is 20A.

Chargaff's rule regarding the equal amount of adenine and thymine as well as guanine and cytosine is matching with this structure. All the other rules also do match with this DNA structure.

3 0
3 years ago
What is not a step in most scientific investigations
Mariulka [41]

Question options:

1. developing a hypothesis to explain collected data

2. proving a theory and writing a new scientific law  

3. collecting data through observation and measurement

4. observing and experimenting to test a hypothesis

Answer:

2. proving a theory and writing a new scientific law  

Explanation:

Providing a theory and write a new scientific law is not a step of scientific investigation. To prove a law a theory, its take many years of research.

There are steps of scientific investigations below,

1. Make an Observation.

2. Form a Question.

3. Form a Hypothesis.

4. Conduct an Experiment.

5. Analyze the Data and

6. Draw a Conclusion.

These step of scientific investigation does not include to write a theory and scientific law.

4 0
3 years ago
What is a stored form of carbohydrate in the muslces and liver quzilet?
MArishka [77]
A stored form of carbohydrate in animals' muscle and liver is glycogen.
Glycogen is a polysaccharide (starch) made of repeating units of glucoses bonded together.
4 0
3 years ago
The brain send signals that control the speed at which food moves through the digestive system. What systems are involved?
nadezda [96]
C. Muscular digestiv nervous
8 0
2 years ago
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